The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 1980
Filed:
Jun. 23, 1978
Ernst A Rutishauser, Widen, CH;
RCA Corporation, New York, NY (US);
Abstract
Video disc player is switchable between two operating modes: (1) for playback of records of color signals of one scanning standard (15,625 Hz. line frequency; 50 Hz. field frequency) encoded in a buried subcarrier format; (2) for playback of records of color signals of another scanning standard (15,734.26 Hz. line frequency; 59.94 Hz. field frequency) also encoded in a buried subcarrier format, but with a different subcarrier frequency. When operating in mode (1), recovered signals are heterodyned with output of a VCO to up-convert chrominance signal and accompanying color synchronizing component. Control of VCO is effected in accordance with output of a phase detector responding to up-converted color synchronizing component and to reference oscillations, whereby up-converted signals are stabilized against time-base errors. Switching to mode (2) effects a shift of reference oscillation frequency (or of nominal VCO output frequency) by an amount equal to frequency difference between respective subcarrier frequencies.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile